ARMTEL ARMT.665200.003UM, User Manual

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DCN-2 CENTRAL EXCHANGE
User Manual
armtel.com
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ENG
1.1.2 Specifications
DCN-2 has the following interfaces:

from 4 to 16 of E1 (G.703/G.704) – for connection DCN-16U, DCN-15A
subscriber exchange units, DCN IP-gateway modules, multichannel digital
communications recorders, other stations (central stations) of DCN system and
digital ATSs;

Ethernet (RJ-45 connector) – for remote access to CPU of DCN-2 Central
Exchange from the system administrator computer via IP-network;

RS-232 (V.24) – serial interface, technology connector for service purposes (not
used).
The product maintains the following standardized communication protocols:

Q.931 – for establishing communications at OSI network layer model (Layer 3
specification for D-channel), provides control of your calls and a set of additional
services, call routing service for users with switched channels;

I.452 (Q.932) – general procedures for controlling ISDN additional services;

ANSI T1.604 – a minimum set of services of basic ISDN channel interface;

Q.921 (LAP-D) – for determining the structure and content of the picture frame
on the field data link layer of OSI model (D channel), a network ISDN user
interface – specification of coherent information level;

I.430 CCITT recommendation (standard ISDN) to arrange the information in the
physical layer of OSI model and basic access;

I.431 CCITT recommendation (standard ISDN) to arrange the information in the
physical layer of OSI model and basic access;

I.432 CCITT recommendation (standard ISDN) - network interface of B-ISDN user
- Physical Layer Specification;

DSS1 – subscriber signaling protocol.